Hi,
The meta description tag should show in the <head> section of the source code. You might want to try requesting for updated information in Google Search Console to signal to Google that your meta description has been updated — https://yoast.com/help/fetch-as-googlebot/
However, please do note that it will still be the final say of Google as to when they would decide to recrawl your website (which could take hours or days, depending on certain factors) and if they decide to output your preferred meta description, or if they would still just output their version of the snippet which they believe gives a better description of the page.